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Not to be confused with U Geminorum.
υ Geminorum
Observation data
Epoch J2000.0       Equinox J2000.0 ( ICRS)
Constellation Gemini
Right ascension 07h 35m 55.34970s [1]
Declination +26° 53′ 44.6751″ [1]
Apparent magnitude (V) 4.04 [2] (4.04 - 4.08 [3])
Characteristics
Spectral type M0 III [4]
U−B color index +1.96 [2]
B−V color index +1.54 [2]
Variable type suspected [3]
Astrometry
Radial velocity (Rv)−21.61±0.19 [5] km/s
Proper motion (μ) RA: −34.12 [1]  mas/ yr
Dec.: -106.96 [1]  mas/ yr
Parallax (π)12.04 ± 0.68  mas [1]
Distance270 ± 20  ly
(83 ± 5  pc)
Absolute magnitude (MV)−0.53 [6]
Details
Mass1.52 [7]  M☉
Radius44 [5]  R☉
Luminosity417 [5]  L☉
Surface gravity (log g)1.0 [5]  cgs
Temperature3,926±16 [5]  K
Metallicity [Fe/H]0.17 [7]  dex
Rotational velocity (v sin i)5.9 [5] km/s
Age3.53 [7]  Gyr
Other designations
υ Gem, 69 Geminorum, BD+27° 1424, FK5 1196, HD 60522, HIP 36962, HR 2905, SAO 79533. [8]
Database references
SIMBAD data

Upsilon Geminorum, Latinized from υ Geminorum, is a star in the constellation Gemini. It has an apparent visual magnitude of 4.04, [2] which is bright enough to be seen with the naked eye. Based upon an annual parallax shift of 12.04  mas, [1] it is around 270  light years from the Sun. There is a visual companion: a magnitude 13.20 star located at an angular separation of 55.20 ″ along a position angle of 40°, as of 2008. [9]

This is an evolved red giant star with a stellar classification of M0 III. [4] It is estimated to have 1.52 [7] times the mass of the Sun, but has expanded to 44 [5] times the Sun's radius. The star is spinning with a projected rotational velocity of 5.9 km/s [5] and is about 3.53 [7] billion years old. Upsilon Geminorum is radiating 417 times the solar luminosity from its outer atmosphere at an effective temperature of 3926 K. [5]

Based upon the motion of this star through space, Upsilon Geminorum is a member of the Wolf 630 moving group. This is a set of stars centered on Wolf 630 that are moving nearly in parallel and have an age of around 2.7±0.5 billion years. They may be former members of a dissolved open cluster. [10]

References

  1. ^ a b c d e f van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv: 0708.1752, Bibcode: 2007A&A...474..653V, doi: 10.1051/0004-6361:20078357, S2CID  18759600.
  2. ^ a b c d Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data, SIMBAD, Bibcode: 1986EgUBV........0M.
  3. ^ a b Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 1. Bibcode: 2009yCat....102025S.
  4. ^ a b Morgan, W. W.; Keenan, P. C. (1973), "Spectral Classification", Annual Review of Astronomy and Astrophysics, 11: 29, Bibcode: 1973ARA&A..11...29M, doi: 10.1146/annurev.aa.11.090173.000333.
  5. ^ a b c d e f g h i Massarotti, Alessandro; et al. (January 2008), "Rotational and Radial Velocities for a Sample of 761 HIPPARCOS Giants and the Role of Binarity", The Astronomical Journal, 135 (1): 209–231, Bibcode: 2008AJ....135..209M, doi: 10.1088/0004-6256/135/1/209.
  6. ^ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv: 1108.4971, Bibcode: 2012AstL...38..331A, doi: 10.1134/S1063773712050015, S2CID  119257644.
  7. ^ a b c d e Luck, R. Earle (September 2015), "Abundances in the Local Region. I. G and K Giants", The Astronomical Journal, 150 (3): 23, arXiv: 1507.01466, Bibcode: 2015AJ....150...88L, doi: 10.1088/0004-6256/150/3/88, S2CID  118505114, 88.
  8. ^ "ups Gem". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2016-12-08.{{ cite web}}: CS1 maint: postscript ( link)
  9. ^ Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal, 122 (6): 3466–3471, Bibcode: 2001AJ....122.3466M, doi: 10.1086/323920.
  10. ^ Bubar, Eric J.; King, Jeremy R. (August 2010), "Spectroscopic Abundances and Membership in the Wolf 630 Moving Group", The Astronomical Journal, 140 (2): 293–318, arXiv: 1005.1205, Bibcode: 2010AJ....140..293B, doi: 10.1088/0004-6256/140/2/293, S2CID  118455341.

External links

  • Kaler, James B. (March 2, 2012), "Upsilon Geminorum", Stars, University of Illinois, retrieved 2016-12-08.
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